Search a number
centered pentagonal n.  and  twin primes

First numbers that belong to both sets:

31, 181, 601, 1051, 3331, 5641, 5881, 14251, 19141, 31081, 43891, 51481, 63601, 70141, 70981, 84181, 92641, 104551, 116101, 133981, 206641, 225751, 256801, 317731, 330331, 385141, 433681, 459031, 574801, 674701, 819391, 901501, 1009651, 1012831, 1130641, 1157701, 1294201, 1337731, 1426951, 1618051, 1699501, 1711891, 1778731, 1829701, 1881391, 1916251, 2022751, 2118301, 2150641, 2301601, 2462641, 2583181, 2618881, 2727451, 2790481, 3000301, 3531331, 3915631, 4273891, 4412281, 4757551, 4987891, 5101531, 5651281, 5986891, 6492331, 7026631, 7783651, 7810141, 7916551, 8285551, 8533141, 9413851, 10125391, 10155601, 10988281, 11540131, 11658601, 12226831, 13138891, 13788631, 14586601, 14647051, 14683381, 15531391, 15681301, 15920131, 16339231, 16492981, 16686181, 17272531, 17430601, 17589391, 17855641, 17895751, 18394141, 18995731, 19705141, 20001031, 20100151, 20398981, 20685631, 21425641, 21793141, 22134001, 22492501, 23172451, 23401351, 24094801, 24281431, 25528051, 26773141, 27084931, 28637101, 29027641, 29437981, 29920351, 32463031, 33699781, 33773251, 33920431, 35730451, 37162201, 37859431, 38484631, 39511501, 39930031, 40230331, 40652641, 40814101, 41850931, 42363931, 42673231, 43336831, 45124381, 47099851, 49006891, 50974351, 51449581, 51722131, 52269391, 53372551, 54674131, 55613431, 55896781, 57013501, 58745641, 58963981, 59645851, 61194391, 62612551, 65548801, 66164701, 68761951, 70026391, 70556641, 71837401, 73535881, 73780141, 74761231, 76162201, 76825981, 77520481, 78750391, 84085501, 84433831, 86421301, 86803891, 87246391, 88312981, 89745181, 95095141, 98580301, 99713851, 101617501, 106912651, 107436451, 109975141, 110506381, 113821891, 115311181, 117906391, 118628581, 121644001, 121818451, 123499531, 127145731, 128432641, 131025901, 134084131, 139259581, 139745131, 141056581, 141507631, 142562881, 143205481, 143925391, 147475201, 149169751, 150369451, 152080501, 152548831, 152900551, 154783231, 156677431, 158105641, 165343891, 165995131, 166117381, 166484401, 172370281, 174870331, 175540051, 180306391, 181966231, 185093551, 190248631, 194326681, 201399001, 202117681, 206320351, 206683891, 209741101, 210703951, 212866891, 215644141, 221111551, 227505151, 232107151, 234619141, 236949901, 249375391, 255808351, 259310101, 259513831, 261299881, 262989481, 264375931, 265611391, 271675501, 275441281, 276071431, 276912751, 286412281, 289686151, 293086891, 299619391, 302527501, 303187891, 304731601, 305339131, 312508951, 324871501, 325384681, 327441451, 327670381, 332496391, 336835141, 337531951, 339393631, 340793251, 342898081, 351441481, 360510181, 364121731, 368722201, 377272351, 381151891, 381954901, 384679051, 392408281, 395609551, 401417281, 402431641, 405800851, 411939331, 429516391, 434577601, 437218501, 438541951.

Some larger examples :