A176671 Primes not of the form p + 2^k*k^2 for p prime and k > 0.

2, 3, 11, 17, 37, 41, 67, 71, 97, 107, 127, 137, 149, 157, 163, 191, 233, 277, 281, 307, 331, 337, 367, 373, 397, 401, 443, 457, 487, 499, 509, 541, 547, 577, 599, 607, 631, 683, 701, 709, 727, 739, 751, 757, 761, 769, 787, 809, 821, 877, 919, 941, 971, 977

Offset

1,1

Links

Table of n, a(n) for n=1..54.

Maple

A007758 := proc(n) 2^n*n^2 ; end proc: isA176671 := proc(n) if isprime(n) then for i from 1 do a58 := A007758(i) ; if a58 >n then return true; elif isprime( n-a58) then return false; end if ; end do: else true; end if; end proc: for n from 1 to 200 do p := ithprime(n) ; if isA176671(p) then printf("%d, ", p) ; end if; end do: # R. J. Mathar, Apr 26 2010

Crossrefs

Cf. A007758.

Sequence in context: A250175 A038907 A019417 * A191085 A024859 A023870

Adjacent sequences: A176668 A176669 A176670 * A176672 A176673 A176674

Keyword

nonn

Author

Juri-Stepan Gerasimov, Apr 23 2010

Extensions

Corrected (37 inserted, 853 removed, 907 removed) by R. J. Mathar, Apr 26 2010

Status

approved